I read over the recalls and they do have recalls on brake and turn signal lights but not the low beam headlights while driving at night.
Sounds like the relay or headlamp driver module relay 46, for the headlights is going bad, though.
Or, it could alternatively be bad grounding of wire somewhere or bad wiring in general.
I would check in the underhood fuse box for the relay and see if wiggling it to ensure a good connection helps matters.
Underhood Fuse Block
4.2L Engine
Except Saab
Underhood Fuse Block (2002 - 2005 Early Production)
Underhood Fuse Block (2005 Late Production - 2007)
Saab
Underhood Fuse Block (2005)
Underhood Fuse Block (2005 - 2007)
5.3L Engine
Except Saab
Underhood Fuse Block (2003 - 2005 E2004 trailblazer. Low beam headlights - gm-06-53-1632.gif
Underhood Fuse Block (2006 - 2007)
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